Combined chain lock and burglar-alarm.



No. 683,535. Patented Oct. I, l90l. N. D. WELLS. COMBINED cI-IAIN LOCK AND BURGLAR ALARM.

, 'N P'T R fffiwpuzg (Application filed Feb. 21, 1901.)

(No Model.)

ATT RN Y- NITED STATES PATENT OFFICE.

NELSON D. WELLS, OF DAYTON, OHIO.

COMBINED CHAIN LOCK AND BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 683,535, dated October 1, 1901. Application filed February 21, 1901. Serial No. 48,316. (N0 model.)

To all whom it may concern:

Be it known that I, NELSON D.WELLs,a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in a Combined Chain Lock and Burgla1'-Alarn1;and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention comprises a combined chain lock and burglaralarm. The usual chain bolt as heretofore constructed, as is well known, comprises means for permitting a partial opening of a door, so as to prevent entrance of intruders. With this ordinary chain bolt there is no alarm attachment; but my invention comprises both combined, as will hereinafter be more fully described.

While I show my invention attached to a door and door-frame, it is equally as useful as an attachment for a window, its operation being the same whether it be applied to a door or a window.

Preceding a detail description of myinvention reference is made to the accompanying drawings, of which- Figure 1 is a front elevation of a portion of a door and door-frame, showing my invention in position thereon, the bell appearing in section. Fig. 2 is a top view with the door open to the limit permitted by the chain. The bell is removed from this view. Fig. 3 is a detached sectional view of the device on the line w a: of Fig. 1.

A designates a gong or hell secured to an arbor B, the other end of said arbor B being fixed in plate 0. This plate 0 is rigidly connected to a bracket D, by means of which the device is secured to the door-frame E in a suitable position to be reached by the hand. On the arbor B there is fixed a tubular rotating arm 1*. Inclosed in the ends of this arm there are balls at, which are maintained in position by lips I) projecting from opposite sides of the ends of said tubular arm F and slightly bent inwardly. These balls in the rotation of the arbor B are thrown outwardly by centrifugal force and alternately strike the projection c on the inner surface of the bell and cause an alarm to be sounded. On the arbor B there is a center pinion G, which meshes with aspur-wheel H on arbor H. On the arbor H there is a pinion I, which is driven from a master-wheel J. This last-named wheel is keyed to a shaft K, one end of which is journaled in a bearing K, secured to the plate O, and the other end of which is journaled in the bracket D. Upon this shaft K one end of a clock-spring L is secured, and the other end of said clockspring is secured to a shaft M. This spring furnishes the driving power for the arbor B. Keyed to the shaft K is a grooved pulley N, to which is fixed at N an end of the lockchain 0. The other end of said chain 0 is detachably secured to an arm P, which extends from a bracket which is secured to the door Q. The length of this chain when unwound is only suflicient to permit the door Q to be partially openedsay to the extent of five or six inchesso that a person opening the door may see who is on the outside. The act of opening the door to the extent limited by such chain will cause the arbor B to be rotated through the gearing consisting of the train between the shaft K and the arbor B. This rotation of the arbor B will rot-ate the arm F and cause a vigorous sounding of the gong A, which will give an alarm to the occupants of the house in cases where burglars try to enter. In the day-time, if necessary, the chain 0 may be easily detached from the hook or other fastening device R, and the device thus placed out of an operative position at such times when its use is not necessary; but with the approach of night, or, in fact, at any other time when it is desired to use the device, the chain may be placed in the position shown in Figs. 1 and 2. The chain passes between two pulleys T and T on shaft-s M and M and is guided in its movement with a minimum amount of friction. The chain will pull straight through these pulleys and will rotate the pulley N. The tension exerted upon the chain by the spring L is suffioient to close the door when such door is released. When the dooror window is opened, the spring L is compressed and the alarm is sounded. The alarm is also sounded when pulley, said chain adapted to be unwound and rewound on'such pulley by the opening and closing of a door, during each of which movements an alarm will be sounded, and whereby the opening of the door is limited by suchchain, substantially as specified.

In testimony'whereof I aflix my signature in presence of two witnesses.

NELSON D. WELLS. Witnesses:

R. J. MGOARTY, R. E. D. WEISE. 

